Back-pressure and exhaust relief-valve.



A. ROSEN. BACK PRESSURE AND EXHAUST RELIEF VALVE.

APPLICATION FILED DEC. 27, 1911. 1,054,034, Patented Feb; 25, 1918.

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WITNESSES A. ROSEN. BACK PRESSURE AND EXHAUST RELIEF VALVE. APPLICATION FILED Dim 27, 1911.

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ALEXIS ROSEN, 0F PHILADELPHIA, PENNSYLVANIA.

BACK-PRESSURE AND EXHAUST BELIEF-:VALVE.

Specification of Letters Patent. I Patented Feb, 25, 1913 Application filed December 27, 1911.

Serial No. 668,163.

To all whom it may concern:

Be it known that I, ALEXIS Rosnrz, a subject of the Czar of Russia, having resided in the United States for one year last past and having declared my intention of becoming a citizen thereof, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Back-Pressure and Exhaust Relief-Valve, of which the following is a specification.

My invention consists of an improved back-pressure valve for conduits for fluid under pressure, in which the area of the fluid passage is regulated according to the pressure of the fluid.

It further consists of improved means for controlling such regulation.

It further consists of improved means for checking the shock of the valve closing under reduced pressure or back-pressure.

It further consists of other novel features of construction, all as will be hereinafter fully set forth.

The annexed drawings and the following -description set forth in detail one mechanical form embodying the invention, such detail construction bein but one of various mechanical forms in wnich the principle of the invention may be used.

In said annexed drawings-FFigure 1 represents a side elevation of my improved valve-mechanism. Fig. 2 represents an axial section of the same. Fig. 3 represents a transverse section on the line w-w in Fig. 2. Fig. 4 represents a detail View of another form of adjustable counter-pressure device for the valve.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings, the reference numeral 1 indicates a casing, cylindrical for the greater portion of its length and formed with an outwardly extending flange, 2, at its inlet end and contracted at its outlet end to form a neck, 3, having a flange, 4, for connecting it to an exhaust pipe or other discharge means. A bottom, 5, is secured by bolts, 6, and nuts, 7, to the wide flange of the casing, and said bottom has a tubular neck, 8, having a flange, 9, to which a pipe or other conduit for fluid may be connected. This neck is continued from the inner face of the bottom by a cylinder, 10. of slightly larger interior diameter than that of the neck to form an annular shoulder 11, at the outer end of the cylinder. The wall of the 1 cylinder is formed with an annular port,

comprising a series of openings, 12, a short and with a closed outer end, and formed with circumferential grooves, 14, in which packing-rings, 15, are placed, is fitted to slide in the cylinder. A pin, 16, is secured diametrically through the piston, and a connecting rod, 17, has one end pivoted upon such pin. A rock'shaft, 18, is journaled in a bearing, 20, near the outlet end of the easing, and a crank, 21, is secured to the inner end of said shaft and has the other end of the connecting rod pivoted to its pin, 22. Said crank is of such length that the piston will just cover the .ports in the cylinder when the crank stands forty-five degrees away from the axial line of the cylinder. A bell-crank, 23, is secured to the outer end of the rock-shaft and has an arm, 24, projecting at an angle of one hundred and thirty-five degrees (185) to the crank. A chain 25, preferably of the iink or bicycle chain type, is connected to the outer end of said bell-crank arm and to a stud, 26, upon the side of the casing, and is of such ien h that it will be straightened and stop rocking of the rock-shaft when the piston bareiy touches the annular shoulder in the cylinder. A spring, 27, is attached to the outer end of the other arm, 28, of the bell-crank, which arm preferably stands at an angle of onehundred' and thirty-five degrees (185) to the former arm, and the other end of said spring is attached to a yoke, 29, secured to the piston, the inner face of each of said- .rings is provided with a shallow slot, 3'2,

which is engaged by the head of a screw, 38, in the bottom of the packing-groove in the piston.

In Fig. 4 of the drawings is illustrated another form of counter-pressure device, in which the arm .28 of the bell-crank is extended and has a counter-weight, 39,

slidable upon it and adjusted by means of a set-screw, 4:0. This form may be preterable where the pressure is considerable and the pull of a spring not sufficiently against the closed end of the piston and -move the same to overcome the counterpressure oi the spring or weight, and will thus gradually uncover the annular port and allow the fluid to enter the annular space between the cylinder and casing, whence it will pass out through the outlet and be suitably disposed of. As the area of the annular port is greater than that of the inlet, there will be less fiuid-pressure within the casing than against the piston, owing to the expansion of the fluid, so that, the fluid acting against the piston acts only against the adjustable counter-pressure. If any back-pressure occurs by diminution of pressure on the inlet vside or increase of pressure at the outlet side of the piston, the counter-pressure device will move the piston to either partly orentirely close the annular port in the cylinder, and such backpressure cannot reenter the source of the fluid, but will be shut oi'f from such return.

caused by the sudden return'of the piston will be borne by the bell-crank arm, the chain and the stud upon the casing, so as to prevent injury to the piston by striking the annular shoulder. By placing the stopmechanism for the valve exteriorly of the casing and valve-chamber,'all injury tothe valve-piston and its cylinder by the shock of the closing valvepisoon will thus be avoided, and the mechanism is accessible for adjustment or repair without the necessity of access to the interior of the easing.

This device is applicable to the exhaustgipes of steam engines and to all other uid conduits whether such fluid be gaseous or li uid.

()t or modes of ap lying the principle of my invention may lie employed for the mode herein explained. Change may therefore be made as regards the mechanism thus disclosed, provided the principles of construction set forth, respectively, in the following claims are employed.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is:

1. A device of the character stated, comnoeaoae prising a casing having an inlet and an outlet, a cylinder within said casing and communicating at one end with said inlet and formed at said end with an annular port, a closed piston reciprocable within said cylinder and across said port, adjustable pressure-means connected to the piston to force thejsame to close the port, and separate means exterior of the casing and connected to the piston to stop the closing movement of the same.

2. In a device of the character stated, a casing having an inlet and an outlet, a cylinder within said casing and communicating at one end with said inlet and formed at said end with an annular port, a closed piston reciprocable in said cylinder and across said port, adjustable resilient pressuremeans connected to said piston to force the same to close the port, and flexible means connected to said piston and rigidly secured to the casing to stop the closing movementof the piston.

3. In a device of the character stated, a substantially cylindrical casing having an inlet at one end and an outlet at the other end, a cylinder extending in said casing from the inlet and having an annular series of openings through its wall at said end, a hollow piston having a closed end and reciprocable in said cylinder and over said openings, a rock-shaft journaled in the casing and having a crank at its inner end, a connecting rod pivotally connected to said crank and to the piston, an arm secured to the outer end of the rockshaft, and a spring connected to said arm.

4. lln a device of the character stated, a substantially cylindrical casing having an inlet at one end and an outlet at the other end, a cylinder extending in said casing from the inlet and having an annular series of openings through its wall at said end, a hollow piston having a closed end and reciprocablein said cylinder and over said openings, a rock-shaft journaled in the cas ing and having a crank at its outer end, a connectin rod pivotally connected to said crank-.an to the piston, an arm secured to the outer end of the rock-shaft, a spring connected to said arm, and means "for adjusting the tension of said spring.

5. ln a device of the character stated, a substantially cylindrical casing having an inlet at one end and an outlet at the other end, a cylinder extending in said casing from the inlet and having an annular series of openings through its wall atsaid end, a

hollow piston having a closed end and reciprocable in said cylinder and over said openings, a rock-shaft journaled in the easing and having acrank at its outer end, a connecting-rod pivotally connected to said crank andto the piston, an arm secured to the outer end of the rock-shaft, a spring connected to said arm, a yoke having the other end of said spring attached to it, rods guided upon the casing and having said yoke secured to their ends, a yoke secured tothe opposite ends of said rods, and a screw having its ends stepped in a bearing upon the casing and threaded throughtsai last yoke.

6. In a device of the character stated, a substantially cylindrical casing having an inlet at one end and an outlet at the other end, a cylinder extending in said casing from theinlet and having an annular series of openings through its wall at said end,-a hollow piston having a closed end and reciprocable in said openings, ,a r ock-sha t journaled in the easing and having a crank at its inner end, a connecting rod pivotally connected to said crank and to the piston, a bell-crank secured upon the outer end of said shaft, a spring connected to one arm of said bell-crank, and

a chain secured to the casing and connected to the other arm of the bell-crank.

7. In'adevice of the character stated, a substantially cylindrical casing having an outlet opening at'one'end and a flange at ciylinder and over said the other end, a bottom secured to said flange and having a central inlet neck and a cylinder' extending into the casing and formed with an annular series of openings nearthe bottom' and an internal annular shoulder, a hollow piston having a closed end and fitted to slide in the cylinder, a' pin transversely secured in the piston, a connecting rod pivoted upon said pin, a rockshaft journaled in a bearing in the casing near the outlet end, a crank secured upon the inner end of said rock-shaft and having the connecting-rod pivoted upon its pin, a bell-crank secured upon-the outer end of the rock-shaft, a spring connected to one arm of said bell-crank, rods sliding in the flange of the casing and having a yoke at their ends to which the spring is attached and a yoke at the other ends, ,a screw threaded through said latter yoke and stepped in thetfiange of the casing, and a chain secured at one end to a stud on the .casingand at the other end to the other arm of the bell-crank. 1 ALEXIS ROSEN.

Witnesses:

Orrs MONTGOMERY, MERRITT MOKEAN. 

